mirror of
git://sourceware.org/git/lvm2.git
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01c4ac1315
o Created dmfs.h as a private header for the filesystem code o Using seq_file.[ch] written by Al Viro as a generic mechanism for /proc style files which have one record per line. We use a slight modification here, so if you are using a recent -ac kernel you'll need to replace the existing seq_file.[ch] with the ones here and do a bit of editing to make it work. I'll submit the changes to Al Viro shortly as they are very small and I think make sense generally. o Using fail_writepage() o Init code for filesystem now all in dmfs-super.c o Some common code reduction amoung the dmfs-*.c files o Auto allocation of major device number (default). You can specify a particular major by using a module argument. If built in then you don't get this option at the moment but it could be added if required. o Hotplug support o General tidying o Updated projects.txt file o Patches updated to 2.4.14
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
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* dmfs-tdir.c
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*
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* Copyright (C) 2001 Sistina Software
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*
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* This software is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/* Heavily based upon ramfs */
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#include <linux/config.h>
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#include <linux/fs.h>
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#include "dm.h"
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#include "dmfs.h"
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extern struct inode *dmfs_create_error(struct inode *, int);
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extern struct inode *dmfs_create_table(struct inode *, int);
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extern struct inode *dmfs_create_status(struct inode *, int);
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static int dmfs_tdir_unlink(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = dentry->d_inode;
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inode->i_mapping = &inode->i_data;
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inode->i_nlink--;
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dput(dentry);
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return 0;
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}
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static struct dentry *dmfs_tdir_lookup(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = NULL;
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const char *name = dentry->d_name.name;
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switch(dentry->d_name.len) {
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case 5:
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if (memcmp("table", name, 5) == 0) {
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inode = dmfs_create_table(dir, 0600);
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break;
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}
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if (memcmp("error", name, 5) == 0)
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inode = dmfs_create_error(dir, 0600);
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break;
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case 6:
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if (memcmp("status", name, 6) == 0)
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inode = dmfs_create_status(dir, 0600);
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break;
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}
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d_add(dentry, inode);
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return NULL;
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}
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static int dmfs_tdir_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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int i;
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struct dentry *dentry = filp->f_dentry;
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i = filp->f_pos;
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switch(i) {
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case 0:
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if (filldir(dirent, ".", 1, i, dentry->d_inode->i_ino, DT_DIR) < 0)
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break;
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i++;
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filp->f_pos++;
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/* fallthrough */
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case 1:
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if (filldir(dirent, "..", 2, i, dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
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break;
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i++;
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filp->f_pos++;
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/* fallthrough */
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case 2:
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if (filldir(dirent, "table", 5, i, 2, DT_REG) < 0)
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break;
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i++;
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filp->f_pos++;
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/* fallthrough */
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case 3:
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if (filldir(dirent, "error", 5, i, 3, DT_REG) < 0)
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break;
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i++;
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filp->f_pos++;
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/* fallthrough */
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case 4:
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if (filldir(dirent, "status", 6, i, 4, DT_REG) < 0)
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break;
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i++;
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filp->f_pos++;
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}
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return 0;
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}
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static int dmfs_tdir_sync(struct file *file, struct dentry *dentry, int datasync)
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{
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return 0;
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}
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static struct file_operations dmfs_tdir_file_operations = {
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read: generic_read_dir,
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readdir: dmfs_tdir_readdir,
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fsync: dmfs_tdir_sync,
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};
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static struct inode_operations dmfs_tdir_inode_operations = {
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lookup: dmfs_tdir_lookup,
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unlink: dmfs_tdir_unlink,
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};
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struct inode *dmfs_create_tdir(struct super_block *sb, int mode)
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{
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struct inode *inode = dmfs_new_private_inode(sb, mode | S_IFDIR);
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if (inode) {
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inode->i_fop = &dmfs_tdir_file_operations;
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inode->i_op = &dmfs_tdir_inode_operations;
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}
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return inode;
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}
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